Probing the Difference Between Amorphous and Granular Superconducting Nanowires in Transport Measurements

Research output: Contribution to journalArticlepeer-review


Superconducting non-granular quasi-one-dimensional (1D) NbN nanowires and relatively wide granular wires of the same material exhibit similar magneto-transport behavior arising from different physical origin. Both types of wires exhibit a broad transition into the superconducting state with non-vanishing resistance well below Tc, and negative magnetoresistance (nMR) decreasing in magnitude with temperature. A distinct behavior between the two wires is revealed in their response to increasing current. In V-I measurements, the 1D wires exhibit finite initial slope, i.e., zero critical current, at all temperatures below the transition, while the granular wires exhibit a nonzero critical current that depends on temperature. Also, the two wires differ from each other in the current dependence of the nMR. In the 1D wires, at low temperature, the nMR decreases monotonically with the current, while in the granular wires the nMR initially increases with the current. The different current response of the two types of wires indicates the different physical origin of their behavior: That of the 1D wires is attributed to fluctuations of the order parameter, while that of the granular wires reflects the response of an inhomogeneous chain of Josephson junctions.

Original languageEnglish
Pages (from-to)729-735
Number of pages7
JournalJournal of Superconductivity and Novel Magnetism
Issue number4
StatePublished - Apr 2024

Bibliographical note

Publisher Copyright:
© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.


  • Josephson junctions
  • Phase slips
  • Superconducting nanowires


Dive into the research topics of 'Probing the Difference Between Amorphous and Granular Superconducting Nanowires in Transport Measurements'. Together they form a unique fingerprint.

Cite this